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Method for preparing lithium hydroxide through bipolar membrane electrolysis and bipolar membrane electrodialysis device

A technology of bipolar membrane electrodialysis and lithium hydroxide, applied in electrolysis process, electrolytic components, organic diaphragm, etc., can solve the problems of insufficient durability, high production cost, and the purity of lithium hydroxide cannot meet the requirements of battery use, etc., to achieve Effects of improving purity, preventing corrosion, and improving mechanical properties

Inactive Publication Date: 2021-06-22
安徽南都华铂新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing lithium hydroxide by electrolysis of a bipolar membrane and a bipolar membrane electrodialysis device, to overcome the lack of durability of the existing electrolysis device, and the purity of the prepared lithium hydroxide cannot meet the requirements of the battery , the problem of higher production costs

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0026] The bipolar membrane electrodialysis device includes two electrodes and three sets of membranes arranged between the two electrodes. The membrane sets include negative membranes, bipolar membranes and positive membranes arranged in sequence. A salt chamber is formed between the electrodes and the negative membranes. An alkali chamber is formed between the negative membrane and its adjacent bipolar membrane, an acid chamber is formed between the positive membrane and its adjacent bipolar membrane, and a salt chamber is also formed between the other electrode and the positive membrane.

[0027] The preparation method of the bipolar membrane comprises the following steps: taking sodium diatomate and preparing a 10wt% sodium diatomate aqueous solution, then weighing polyvinyl alcohol to prepare an 8wt% polyvinyl alcohol aqueous solution, and then dissolving 0.5L silicic acid Sodium aqueous solution and 0.5L polyvinyl alcohol aqueous solution were mixed evenly, then 0.08L ace...

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Abstract

The invention discloses a method for preparing lithium hydroxide through bipolar membrane electrolysis and a bipolar membrane electrodialysis device. The bipolar membrane electrodialysis device comprises two electrodes and at least one membrane set arranged between the two electrodes, each membrane set comprises a negative membrane, a bipolar membrane and a positive membrane which are sequentially arranged, a salt chamber is formed between the electrodes and the negative membrane, an alkali chamber is formed between the negative membrane and the bipolar membrane adjacent to the negative membrane, an acid chamber is formed between the positive membrane and the bipolar membrane adjacent to the positive membrane, and a salt chamber is also formed between the other electrode and the positive membrane. According to the invention, the defects in the prior art are overcome, the purity of electrolytic lithium hydroxide is improved, the production cost is reduced, and the durability of the device is improved.

Description

technical field [0001] The invention relates to the technical field of bipolar membrane electrodialysis, in particular to a method for preparing lithium hydroxide by electrolysis of a bipolar membrane and a bipolar membrane electrodialysis device. Background technique [0002] As an important chemical raw material, lithium hydroxide is widely used in the production of glass / ceramics, air refrigeration systems, lithium batteries and nuclear power generation, and lithium-ion or lithium polymer-based energy storage batteries. Lithium hydroxide generally requires a high purity. However, lithium resources are generally extracted from lithium ore or brine. Since the lithium concentration in these resources is low, and generally contain a large amount of calcium and magnesium ions, this makes the process of extracting high-purity lithium more difficult. At present, the commonly used preparation methods of lithium hydroxide are precipitation method and electrolysis method. The elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/16C25B9/23C25B13/08
CPCC25B1/16C25B13/08
Inventor 朱建楠吴国庆徐诗艳
Owner 安徽南都华铂新材料科技有限公司